There is a database with design elements corresponding to multiple languages by checking "Multilingual database" in the database properties.
The language is switched in iOS Settings - General - Language & Region, but the language setting is not reflected in the database opened by HCL Nomad. It seems that the language at the time of HCL Nomad installation is inherited as it is. Languages such as HCL Nomad menus will change.
After rewriting the ContentLanguage value in the iOS environment variable (notes.ini), the database language was switched when HCL Nomad was restarted.
It is helpful to change the language of the database as well as the language of the menu according to the language setting on the terminal side.